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40 = 2 × 2 × 2 × 5
KPK = 2 × 2 × 2 × 3 × 5 = 120 detik
120 detik = 120/60 = 2 menit
Waktu = 30 menit
Banyak tepukan = Waktu/KPK
= 30 menit / 2 menit
= 15 kali tepukan dilakukan bersama sama